HP 9845C

1980 desktop computer by Hewlett-Packard From Wikipedia, the free encyclopedia

The HP 9845C from Hewlett-Packard was one of the first desktop computers to be equipped with a color display and light pen for design and illustration work. It was used to create the color war room graphics in the 1983 movie WarGames.[4][5]

DeveloperHewlett-Packard
TypeDesktop computer
Released1980[1]
Introductory priceUS$39,500 (today $154,300)[1]
Quick facts Developer, Type ...
HP 9845C
DeveloperHewlett-Packard
TypeDesktop computer
Released1980[1]
Introductory priceUS$39,500 (today $154,300)[1]
Discontinued1984 (being outcompeted by the 200 series)[2]
CPUStandard option 1xx:

2 x 16-bit (LPU,[3] PPU) 3-chip hybrid processor with BPC, IOC and EMC

Enhanced option 2xx:
1 x bit-slice processor (LPU)
1 x 16-bit hybrid (PPU)

@ 5.7 MHz[1]
Memory64 - 1600 KB RAM
128 KB ROM[1]
Graphics560 x 455 pixels @ 3 bpp (8 color)[1]
PowerMainframe: 275 W (max), CRT display: 550 W (max)[1]
Weight48.1 kg (106 lb)[1]
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HP 5061-3001 16-bit 4-chip hybrid processor used as the LPU & PPU processors in the HP 9845 series computers. Contains the BPC, IOC, EMC and AEC die.

Features

The attached HP 98770A color display enabled the color graphics with its own CPU and separate power supply, a vector generator based on the AMD2900 bit-slice architecture, graphics memory with three planes of 32 KB each, the connection interface to the mainframe consists of a direct data bus attachment, and a light-pen logic.[1] 4913 colors were available.[1]

The system is a big-endian 16-bit architecture, the BPC, with roots in the HP 2116A which were one of the first 16-bit microprocessors created.[6]

The display showed 8 soft keys on the lower end of the screen, 39 alignment controllers behind a door enabled fine tuning of color convergence.[1]

The speed of the builtin BASIC language was accomplished by implementing time critical parts of it in CPU microcode.[1]

A builtin tape cartridge device with a capacity of 217 kB and transfer speed of 1440 bytes/s enabled storage of data.[1] Average access time for the unit is 6s and a rewind end to end takes 20s. The directory is stored in r/w memory to enable quick access.[7]

More information Option 1xx, Option 2xx ...
Graphics display speed (vectors/sec, overlapped and not clipped)
Option 1xxOption 2xx
For/Next~95~145
Matrix Plot~200~240
Absolute Plot~5 000~5 000
Circles/s not clipped~2~5
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Games

There are four commercial game compilations for the HP 9845 computers, all released from Hewlett-Packard:[8][9] 9845 Computer Games Collection, 9845B Computer Games Library, Computer Games Library Vol. 1 and Monte Carlo Simulation.

See also

References

External links

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